English verb conjugation
COULD FATIGUE

Regular verb: fatigue - fatigued - fatigued

Affirmation

Simple form	V-ing form
I could fatigue you could fatigue he could fatigue we could fatigue you could fatigue they could fatigue	I could be fatiguing you could be fatiguing he could be fatiguing we could be fatiguing you could be fatiguing they could be fatiguing
Perfect	V-ing perfect
I could have fatigued you could have fatigued he could have fatigued we could have fatigued you could have fatigued they could have fatigued	I could have been fatiguing you could have been fatiguing he could have been fatiguing we could have been fatiguing you could have been fatiguing they could have been fatiguing

Negation

Simple form	V-ing form
I couldn't fatigue you couldn't fatigue he couldn't fatigue we couldn't fatigue you couldn't fatigue they couldn't fatigue	I couldn't be fatiguing you couldn't be fatiguing he couldn't be fatiguing we couldn't be fatiguing you couldn't be fatiguing they couldn't be fatiguing
Perfect	V-ing perfect
I couldn't have fatigued you couldn't have fatigued he couldn't have fatigued we couldn't have fatigued you couldn't have fatigued they couldn't have fatigued	I couldn't have been fatiguing you couldn't have been fatiguing he couldn't have been fatiguing we couldn't have been fatiguing you couldn't have been fatiguing they couldn't have been fatiguing

Interrogative form

Simple form	V-ing form
could I fatigue? could you fatigue? could he fatigue? could we fatigue? could you fatigue? could they fatigue?	could I be fatiguing? could you be fatiguing? could he be fatiguing? could we be fatiguing? could you be fatiguing? could they be fatiguing?
Perfect	V-ing perfect
could I have fatigued? could you have fatigued? could he have fatigued? could we have fatigued? could you have fatigued? could they have fatigued?	could I have been fatiguing? could you have been fatiguing? could he have been fatiguing? could we have been fatiguing? could you have been fatiguing? could they have been fatiguing?

Interro-negative form

Simple form	V-ing form
couldn't I fatigue? couldn't you fatigue? couldn't he fatigue? couldn't we fatigue? couldn't you fatigue? couldn't they fatigue?	couldn't I be fatiguing? couldn't you be fatiguing? couldn't he be fatiguing? couldn't we be fatiguing? couldn't you be fatiguing? couldn't they be fatiguing?
Perfect	V-ing perfect
couldn't I have fatigued? couldn't you have fatigued? couldn't he have fatigued? couldn't we have fatigued? couldn't you have fatigued? couldn't they have fatigued?	couldn't I have been fatiguing? couldn't you have been fatiguing? couldn't he have been fatiguing? couldn't we have been fatiguing? couldn't you have been fatiguing? couldn't they have been fatiguing?